/* Copyright (c) 2020 XEPIC Corporation Limited */
/*
 * Copyright (c) 2000-2010 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA.
 */

#include "Attrib.h"

#include <cassert>

#include "config.h"

Attrib::Attrib() {
  nlist_ = 0;
  list_ = 0;
}

Attrib::~Attrib() { delete[] list_; }

const verinum& Attrib::attribute(perm_string key) const {
  for (unsigned idx = 0; idx < nlist_; idx += 1) {
    if (key == list_[idx].key) return list_[idx].val;
  }

  static const verinum null;
  return null;
}

void Attrib::attribute(perm_string key, const verinum& value) {
  unsigned idx;

  for (idx = 0; idx < nlist_; idx += 1) {
    if (key == list_[idx].key) {
      list_[idx].val = value;
      return;
    }
  }

  struct cell_* tmp = new struct cell_[nlist_ + 1];
  for (idx = 0; idx < nlist_; idx += 1) tmp[idx] = list_[idx];

  tmp[nlist_].key = key;
  tmp[nlist_].val = value;

  nlist_ += 1;
  delete[] list_;
  list_ = tmp;
}

bool Attrib::has_compat_attributes(const Attrib& that) const {
  unsigned idx;

  for (idx = 0; idx < that.nlist_; idx += 1) {
    verinum tmp = attribute(that.list_[idx].key);
    if (tmp != that.list_[idx].val) return false;
  }

  return true;
}

unsigned Attrib::attr_cnt() const { return nlist_; }

perm_string Attrib::attr_key(unsigned idx) const {
  assert(idx < nlist_);
  return list_[idx].key;
}

const verinum& Attrib::attr_value(unsigned idx) const {
  assert(idx < nlist_);
  return list_[idx].val;
}
